US9200846B2 - Method for opening and closing a tapping opening of a metallurgical smelting vessel and metallurgical smelting vessel - Google Patents

Method for opening and closing a tapping opening of a metallurgical smelting vessel and metallurgical smelting vessel Download PDF

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Publication number
US9200846B2
US9200846B2 US14/405,250 US201314405250A US9200846B2 US 9200846 B2 US9200846 B2 US 9200846B2 US 201314405250 A US201314405250 A US 201314405250A US 9200846 B2 US9200846 B2 US 9200846B2
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US
United States
Prior art keywords
opening
tapping
wall section
block element
closing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US14/405,250
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English (en)
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US20150145184A1 (en
Inventor
Mathias Luettenberg
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SMS Group GmbH
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SMS Group GmbH
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Publication date
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Assigned to SMS SIEMAG AG reassignment SMS SIEMAG AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LUETTENBERG, MATHIAS
Publication of US20150145184A1 publication Critical patent/US20150145184A1/en
Assigned to SMS GROUP GMBH reassignment SMS GROUP GMBH CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SMS SIEMAG AG
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
    • F27D3/1509—Tapping equipment
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4653—Tapholes; Opening or plugging thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/19—Arrangements of devices for discharging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
    • F27D3/1509—Tapping equipment
    • F27D3/1518—Tapholes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
    • F27D3/1509—Tapping equipment
    • F27D3/1536—Devices for plugging tap holes, e.g. plugs stoppers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D2003/0034—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities
    • F27D2003/0057—Fast-outlet or inlet means

Definitions

  • the invention relates to a method of opening and closing a tapping opening of a metallurgical smelting vessel, in particular, of an electric arc furnace in a bottom region of which, a wall section with an opening is provided, wherein beneath the opening, there is provided a device for opening and closing the tapping opening.
  • the invention further relates to a metallurgical smelting vessel.
  • WO2005/024069 A2 discloses a tapping device for a smelting vessel.
  • a tapping channel is provided with a replaceable nozzle.
  • the nozzle is positioned with a nozzle changer and is replaced after each or after two or more tappings by a new nozzle. This device is relatively expensive.
  • EP 1 172 162 A1 provides a solution according to which two, vertically arranged one above another linear slides are provided in the region of the tapping opening. By corresponding control of the slides, a pourable filling mass is brought in the intermediate space between the slides to close the tapping opening after tapping again.
  • WO 2011/009579 A1 A further solution is disclosed in WO 2011/009579 A1 which involves a sealing and filling tube, a vessel with a filling mass, an opening and closing device, and a lifting mechanism.
  • EP 0 624 769 B1 disclose other specific solutions, in particular, for closing the tapping opening after tapping.
  • Another problem consists in that a high degree of reliability need be insured, i.e., a perfect function of all components during tapping (reliability against non-controlled tapping).
  • an object of the invention is to provide a method of the above-described type as well as a smelting metallurgical vessel which would enable to carry out tapping reliably and cost-effectively.
  • the to-be-used device should be simply formed. The same process conditions should be guaranteed for each tapping.
  • the tapping should be carried out in a reliable manner so that non-controlled tapping can be reliably prevented.
  • This object is achieved according to the invention with a method characterized in that there is provided beneath the opening of the wall section, a device for displacing block elements in a direction transverse to a surface normal of the wall section in a region of the opening, i.e., in tangential direction relative to the wall section or in the plane of the wall section, wherein the device so retains the block elements against the wall section that they sealingly abut the wall section, wherein for closing the tapping opening, the device pushes a block element free of passage openings under the opening, and wherein for opening the tapping opening, the device pushes a block element having at least one passage opening under the opening so that liquid metal can flow out of the smelting vessel through the passage opening in the block element.
  • the device pushes the block elements translationally in the direction transverse to the surface normal of the wall section in the region of the opening.
  • a new block element is used for each closing of the tapping opening.
  • a new block element can be used for each opening of the tapping opening.
  • the passage opening in the block element is at least partially filled with cover sand before placing the block element under the opening.
  • the proposed metallurgical smelting vessel is characterized in that the device has a guide for displacing block elements in a direction transverse to the surface normal of the wall section in the region of the opening, and at least one actuator for displacing the block elements.
  • the guide is formed for sealingly retaining the block elements against the wall section.
  • the guide is a linear guide.
  • an arcuate guide over which the block elements can be rotationally displaced.
  • the actuator is formed as a hydraulic piston-cylinder unit.
  • the block elements are formed as cuboids.
  • the tapping opening can be automatically open and closed.
  • the nozzles are not subjected to any wear that would have, with time, altered the tapping process. Further, a high degree of reliability is achieved.
  • alumina or clay stoppers are used as plugging apparatuses for pouring-in the sliding cover sand.
  • the preferred area of application of the invention is smelting units such as electric arc furnaces (EAF), submerged arc furnaces (SAF), so-called con-arc furnaces.
  • EAF electric arc furnaces
  • SAF submerged arc furnaces
  • FIG. 1 a schematic side view of an electric arc furnace, wherein the tapping opening in the bottom of the furnace is closed;
  • FIG. 2 a schematic side view of the electric arc furnace according to FIG. 1 , wherein the tapping opening is open for letting the melt out;
  • FIG. 3 a schematic side view of the electrical arc furnace according to FIG. 1 , wherein the tapping opening is closed again;
  • FIG. 4 an increased view of the region of the tapping opening in the condition of FIG. 2 , i.e., with the open tapping opening.
  • FIG. 1 schematically shows a metallurgical smelting vessel 2 in form of an electric arc furnace. Scrap is melted in the vessel 2 , with energy being applied through electrodes 12 . Thereby, melt 16 is formed that reaches a certain level.
  • the vessel has a wall with a bottom region 3 in which there is provided a tapping opening 1 through which melt 16 can flow out from the vessel 2 .
  • the tapping opening 1 is open and is closed again in a certain manner.
  • an opening 5 that can be open or closed from beneath.
  • a device 6 that will be described in detail below:
  • a heat-resistant protection tube 15 is arranged above the opening 5 .
  • Opening and closure of the opening 5 in the bottom region 3 of the vessel is carried out by using block elements 7 and which have a cuboid shape.
  • the first block element 7 consists of a heat-resistant body free from any channels.
  • the second block element 8 has a passage opening 9 that functions as an outlet nozzle for fluid metal.
  • the above-mentioned block elements 7 , 8 are purposefully displaced by a device 6 in a direction T transverse to the surface normal of the wall section 4 in the region of the opening 5 , i.e., the displacement takes place in a plane defined by the bottom side of the wall section 4 .
  • the displacement takes place along the surface of the wall section 4 .
  • FIG. 1 shows that the block element 7 is displaced immediately under the opening 5 by an actuator 11 of the device 6 so that the vessel 2 becomes sealed and, as a result, no melt can exit.
  • the scrap is melted in the vessel 2 and a certain level of the melt 16 is produced in the vessel 2 .
  • FIG. 2 shows that the vessel 2 is open at the bottom for tapping i.e., the opening 5 is freed so that the melt 16 can flow out from the vessel 2 .
  • the block element 8 with the passage opening 9 is pushed by the actuator 11 under the opening 5 , so that the melt 16 can flow out from the vessel 2 .
  • FIG. 2 An arrow in FIG. 2 shows that the block element 7 which previously was put in, was displaced out, it is removed.
  • the vessel 2 is closed again, as shown in FIG. 3 .
  • the actuator 11 displaces the next blocking element 7 , which is again without the opening 9 , under the opening 5 , sealing the later.
  • the cover sand fills the opening 5 before the vessel 2 is charged anew.
  • an arrow again shows that the used block elements 7 , 8 , now the block element 8 , is displaced out and is removed.
  • FIG. 4 show details for forming the device 6 .
  • the block elements 7 , 8 are displaced in direction T on a (linear) guide 10 , to this end, the piston-cylinder unit 11 is provided.
  • the block elements 7 , 8 must sealingly abut the bottom of the wall section 4 in order to prevent flow of the melt 16 out of the vessel 2 .
  • the linear guide 10 applies an upwardly directed force to the block elements 7 , 8 so that these elements neatly abut the bottom of the wall section 4 .
  • a bottom sleeve that has an opening 5
  • a heat-resistant protection tube 15 Beneath the bottom sleeve, there is located a displacement system (device 6 ) with nozzle blocks 7 and 8 .
  • a block 8 with a nozzle opening (passage opening) 9 is pushed under the bottom sleeve which is filled with cover sand by a plug 13 .
  • a massive block 7 is placed beneath the bottom sleeve, and the sleeve is filled with cover sand with the filling tube 13 .
  • the charging can begin for starting the smelting cycle.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Charging Or Discharging (AREA)
US14/405,250 2012-06-05 2013-05-16 Method for opening and closing a tapping opening of a metallurgical smelting vessel and metallurgical smelting vessel Expired - Fee Related US9200846B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102012209504 2012-06-05
DE102012209504A DE102012209504A1 (de) 2012-06-05 2012-06-05 Verfahren zum Öffnen und Schließen einer Abstichöffnung eines metallurgischen Schmelzgefäßes und metallurgisches Schmelzgefäß
DE102012209504.7 2012-06-05
PCT/EP2013/060120 WO2013182395A1 (de) 2012-06-05 2013-05-16 VERFAHREN ZUM ÖFFNEN UND SCHLIEßEN EINER ABSTICHÖFFNUNG EINES METALLURGISCHEN SCHMELZGEFÄßES UND METALLURGISCHES SCHMELZGEFÄß

Publications (2)

Publication Number Publication Date
US20150145184A1 US20150145184A1 (en) 2015-05-28
US9200846B2 true US9200846B2 (en) 2015-12-01

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US14/405,250 Expired - Fee Related US9200846B2 (en) 2012-06-05 2013-05-16 Method for opening and closing a tapping opening of a metallurgical smelting vessel and metallurgical smelting vessel

Country Status (6)

Country Link
US (1) US9200846B2 (ko)
EP (1) EP2855713B1 (ko)
KR (1) KR101705266B1 (ko)
DE (1) DE102012209504A1 (ko)
RU (1) RU2593042C1 (ko)
WO (1) WO2013182395A1 (ko)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3851225A1 (de) * 2020-01-15 2021-07-21 Refractory Intellectual Property GmbH & Co. KG Schiebeverschluss für ein metallurgisches gefäss

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012209504A1 (de) * 2012-06-05 2013-12-05 Sms Siemag Ag Verfahren zum Öffnen und Schließen einer Abstichöffnung eines metallurgischen Schmelzgefäßes und metallurgisches Schmelzgefäß
DE102015113241A1 (de) 2015-08-11 2017-02-16 Rhm Rohstoff-Handelsgesellschaft Mbh Verfahren zum Einbringen von Zuschlagstoffen in Metallschmelzen
CN109128125A (zh) * 2018-10-30 2019-01-04 马鞍山钢铁股份有限公司 一种连铸钢包无引流开浇装置及无引流开浇方法

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3230646C1 (de) 1982-08-13 1983-10-20 Mannesmann AG, 4000 Düsseldorf Verfahren und Vorrichtung zum Verschließen des Abstichloches eines feststehenden, nicht kippbaren Elektro-Metallschmelzofens
US4623130A (en) * 1982-08-13 1986-11-18 Brueckner Raimund Refractory member formed of fiber material for use in sliding closure unit
EP0624769A1 (de) 1993-05-13 1994-11-17 MANNESMANN Aktiengesellschaft Verfahren und Vorrichtung zum Verschliessen des Bodenabstichs eines metallurgischen Gefässes
WO1997031736A1 (fr) 1996-02-28 1997-09-04 Vesuvius France S.A. Unite coulissante pour un conteneur metallurgique, et plaque associee
WO1998015374A1 (de) 1996-10-08 1998-04-16 Didier-Werke Ag Verfahren und vorrichtung zum diskontinuierlichen abstechen von schmelzen
JPH10286658A (ja) 1997-04-14 1998-10-27 Sumitomo Jukikai Chiyuutan Kk 連続鋳造機のタンディッシュノズル交換装置
JP2000033465A (ja) 1998-07-22 2000-02-02 Nkk Corp ノズル交換装置
US6210531B1 (en) 1998-10-26 2001-04-03 Px Technologies, Ltd. Forming machines
EP1172162A1 (de) 2000-07-14 2002-01-16 SMS Demag AG Verfahren und Verschliessen oder Öffnen des Abstichloches eines metallurgischen Gefässes, insbesondere eines Elektrolichtbogenofens und zugehöriger Bodenabstich
EP1203920A1 (de) 2000-11-02 2002-05-08 SMS Demag AG Verfahren und Vorrichtung zum Verschliessen und Öffnen eines Schmelzgefässes
WO2005024069A2 (de) 2003-08-29 2005-03-17 Stopinc Aktiengesellschaft Abstichvorrichtung für ein schmelzgefäss, insbesondere für einen konverter
WO2011009579A1 (de) 2009-07-20 2011-01-27 Fuchs Technology Holding Ag Abdicht- und verfüllvorrichtung für einen metallurgischen ofen, metallurgischer ofen und verfahren zum abstechen eines metallurgischen ofens
US20150145184A1 (en) * 2012-06-05 2015-05-28 Sms Siemag Ag Method for opening and closing a tapping opening of a metallurgical smelting vessel and metallurgical smelting vessel

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05200534A (ja) * 1992-01-28 1993-08-10 Kawasaki Steel Corp 取鍋出鋼口からの詰め砂排出処理装置
BE1005987A3 (fr) * 1992-06-16 1994-04-12 Int Ind Eng Sa Dispositif de regulation d'un debit de coulee.
JP2704817B2 (ja) * 1992-11-19 1998-01-26 新日本製鐵株式会社 残湯残滓排出装置
FR2740368B1 (fr) * 1995-10-27 1997-12-12 Vesuvius France Sa Procede de reutilisation de plaques de fermeture a tiroir et plaque pour cette fermeture
JP3364458B2 (ja) * 1999-10-26 2003-01-08 日本サーモケミカル株式会社 金属溶湯収容器用摺動開閉装置のノズル充填材
FR2800309B1 (fr) * 1999-10-28 2001-11-30 Commissariat Energie Atomique Procede et dispositif de soutirage d'un materiau fondu contenu dans un creuset
RU2339887C2 (ru) * 2006-05-29 2008-11-27 Техком Импорт Экспорт Гмбх Промежуточное устройство для отсечения шлака от металла при выпуске их в виде расплава из плавильного агрегата

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3230646C1 (de) 1982-08-13 1983-10-20 Mannesmann AG, 4000 Düsseldorf Verfahren und Vorrichtung zum Verschließen des Abstichloches eines feststehenden, nicht kippbaren Elektro-Metallschmelzofens
US4623130A (en) * 1982-08-13 1986-11-18 Brueckner Raimund Refractory member formed of fiber material for use in sliding closure unit
EP0624769A1 (de) 1993-05-13 1994-11-17 MANNESMANN Aktiengesellschaft Verfahren und Vorrichtung zum Verschliessen des Bodenabstichs eines metallurgischen Gefässes
WO1997031736A1 (fr) 1996-02-28 1997-09-04 Vesuvius France S.A. Unite coulissante pour un conteneur metallurgique, et plaque associee
WO1998015374A1 (de) 1996-10-08 1998-04-16 Didier-Werke Ag Verfahren und vorrichtung zum diskontinuierlichen abstechen von schmelzen
JPH10286658A (ja) 1997-04-14 1998-10-27 Sumitomo Jukikai Chiyuutan Kk 連続鋳造機のタンディッシュノズル交換装置
JP2000033465A (ja) 1998-07-22 2000-02-02 Nkk Corp ノズル交換装置
US6210531B1 (en) 1998-10-26 2001-04-03 Px Technologies, Ltd. Forming machines
EP1172162A1 (de) 2000-07-14 2002-01-16 SMS Demag AG Verfahren und Verschliessen oder Öffnen des Abstichloches eines metallurgischen Gefässes, insbesondere eines Elektrolichtbogenofens und zugehöriger Bodenabstich
EP1203920A1 (de) 2000-11-02 2002-05-08 SMS Demag AG Verfahren und Vorrichtung zum Verschliessen und Öffnen eines Schmelzgefässes
WO2005024069A2 (de) 2003-08-29 2005-03-17 Stopinc Aktiengesellschaft Abstichvorrichtung für ein schmelzgefäss, insbesondere für einen konverter
WO2011009579A1 (de) 2009-07-20 2011-01-27 Fuchs Technology Holding Ag Abdicht- und verfüllvorrichtung für einen metallurgischen ofen, metallurgischer ofen und verfahren zum abstechen eines metallurgischen ofens
US20150145184A1 (en) * 2012-06-05 2015-05-28 Sms Siemag Ag Method for opening and closing a tapping opening of a metallurgical smelting vessel and metallurgical smelting vessel

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3851225A1 (de) * 2020-01-15 2021-07-21 Refractory Intellectual Property GmbH & Co. KG Schiebeverschluss für ein metallurgisches gefäss
WO2021144088A1 (de) * 2020-01-15 2021-07-22 Refractory Intellectual Property Gmbh & Co. Kg Schiebeverschluss für ein metallurgisches gefäss
US11969785B2 (en) 2020-01-15 2024-04-30 Refractory Intellectual Property Gmbh & Co. Kg Sliding closure for a metallurgical vessel

Also Published As

Publication number Publication date
KR20140146660A (ko) 2014-12-26
RU2593042C1 (ru) 2016-07-27
KR101705266B1 (ko) 2017-02-09
EP2855713A1 (de) 2015-04-08
DE102012209504A1 (de) 2013-12-05
WO2013182395A1 (de) 2013-12-12
EP2855713B1 (de) 2016-07-13
US20150145184A1 (en) 2015-05-28

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